netdev - Re: [4/5][BNX2]: Fix occasional counter corruption on 5708.

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Message-Id: <20070604.212417.08667756.davem@davemloft.net>
Date:	Mon, 04 Jun 2007 21:24:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	andy@...yhouse.net, netdev@...r.kernel.org, jd@...junkt.com,
	cat@....com.au
Subject: Re: [4/5][BNX2]: Fix occasional counter corruption on 5708.

From: "Michael Chan" <mchan@...adcom.com>
Date: Mon, 04 Jun 2007 17:01:08 -0700

> [BNX2]: Fix occasional counter corruption on 5708.
> 
> The statistics block DMA on 5708 can be messed up occasionally on the
> average of about once per hour.  If the user is reading the counters
> within one second after the corruption, the counters will be all
> messed up.  One second later, the counters will be ok again until the
> next corruption occurs.
> 
> The workaround is to disable the periodic statistics DMA.  Instead,
> we manually trigger the DMA once a second in bnx2_timer().  This
> manual trigger of the DMA avoids the problem.
> 
> As a consequence, we can only allow 0 or 1 second settings for
> ethtool -C statistics block.
> 
> Thanks to Jean-Daniel Pauget <jd@...junkt.com> and
> CaT <cat@....com.au> for reporting this rare problem.
> 
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Applied.
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